5.5

CVE-2025-23134: ALSA: timer: Don't take register_mutex with copy_from/to_user()

Modified
AliasesUBUNTU-CVE-2025-23134DEBIAN-CVE-2025-23134
Published 16-04-2025Last modified 11-05-2026

Vulnerability summary

CVE-2025-23134 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 10
SUSE-SU-2025:01951-1SUSE-SU-2025:01967-1SUSE-SU-2025:01972-1USN-7594-1USN-7594-2USN-7594-3

Timeline

  1. 16-04-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Don't take register_mutex with copy_from/to_user() The infamous mmap_lock taken in copy_from/to_user() can be often problematic when it's called inside another mutex, as they might lead to deadlocks. In the case of ALSA timer code, the bad pattern is with guard(mutex)(&register_mutex) that covers copy_from/to_user() -- which was mistakenly introduced at converting to guard(), and it had been carefully worked around in the past. This patch fixes those pieces simply by moving copy_from/to_user() out of the register mutex lock again.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.15% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu83 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 3923de04c81733b30b8ed667569632272fdfed9a, < 15291b561d8cc835a2eea76b394070cf8e072771 | ≥ 3923de04c81733b30b8ed667569632272fdfed9a, < 296f7a9e15aab276db11206cbc1e2ae1215d7862 | ≥ 3923de04c81733b30b8ed667569632272fdfed9a, < b074f47e55df93832bbbca1b524c501e6fea1c0d | ≥ 3923de04c81733b30b8ed667569632272fdfed9a, < 3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6 | 6.9
  • linux_kernel≥ 6.9, < 6.12.23 | ≥ 6.13, < 6.13.11 | ≥ 6.14, < 6.14.2
Debian1 product
  • linux< 6.12.25-1

3 vendors · 86 products

References

15 links
Show all 15 references